06 Reduce Downtime with Blue-Green Updates

Check nothing is running

First, click the "Blue CI/CD Pipeline" tab on your right, or follow:

https://[[HOST_SUBDOMAIN]]-843-[[KATACODA_HOST]].environments.katacoda.com/

You should see a message similar to this showing that there is nothing running on the host yet:

step1-empty-toolchain

Next, click the "Green CI/CD Pipeline" tab on your right, or follow:

https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/

You should see a message similar to this showing that there is nothing running on the host yet:

step1-empty-toolchain

Launch blue CI/CD pipeline

We are going to launch the blue CD pipeline first:

cd /root/blue ; docker-compose up -d

(this may take a few minutes to complete as it pulls the necessary docker images)

Launch green CI/CD pipeline

Next, we are going to launch the green CD pipeline in parallel:

cd /root/green ; docker-compose up -d

Check both blue and green CI/CD pipelines are running

Let's confirm that we have two distinct CD pipelines running.

First, click the "Blue CI/CD Pipeline" tab on your right, or follow:

https://[[HOST_SUBDOMAIN]]-843-[[KATACODA_HOST]].environments.katacoda.com/

You should see a dashboard similar to this:

step4-blue-CD-pipeline

Next, click the "Green CI/CD Pipeline" tab on your right, or follow:

https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/

You should see a dashboard similar to this:

step4-green-CD-pipeline

cd <directory>	Change directory
ls	List directory
echo 'contents' > <file>	Write contents to a file
cat <file>	Output contents of file

i	In Command Mode	Change into Insert Mode, you can now insert and edit text in the file
esc	In Insert Mode	Change into Command Mode, you can now execute commands
:wq	In Command Mode	Save and Exit

Welcome!

Congratulations!

You've completed the scenario!

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